Why can't I buy social security when unemployment benefits stop?

Reasons why unemployment benefits stop buying social security:

1. Unemployment benefits stopped, but you didn't go to the local human resources and social security bureau to apply for unemployment benefits, which made it impossible to buy social security.

2. There may be insurance records before employment, but the social insurance premiums paid are insufficient, or the social insurance conditions cannot be met when unemployment is registered.

3, the unit's own economic ability is insufficient, unable to pay out-of-pocket social security fees to the government.